Sensitivity of midnineteenth century tropospheric ozone to atmospheric chemistry-vegetation interactions
We use an Earth System model (HadGEM2-ES) to investigate the sensitivity of midnineteenth century tropospheric ozone to vegetation distribution and atmospheric chemistry-vegetation interaction processes. We conduct model experiments to isolate the response of midnineteenth century tropospheric ozone...
| Main Authors: | , , , , |
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| Format: | Journal Article |
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Wiley-Blackwell Publishing
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/66935 |
| _version_ | 1848761431019749376 |
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| author | Hollaway, M. Arnold, S. Collins, Bill Folberth, G. Rap, A. |
| author_facet | Hollaway, M. Arnold, S. Collins, Bill Folberth, G. Rap, A. |
| author_sort | Hollaway, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We use an Earth System model (HadGEM2-ES) to investigate the sensitivity of midnineteenth century tropospheric ozone to vegetation distribution and atmospheric chemistry-vegetation interaction processes. We conduct model experiments to isolate the response of midnineteenth century tropospheric ozone to vegetation cover changes between the 1860s and present day and to CO 2 -induced changes in isoprene emissions and dry deposition over the same period. Changes in vegetation distribution and CO 2 suppression of isoprene emissions between midnineteenth century and present day lead to decreases in global isoprene emissions of 19% and 21%, respectively. This results in increases in surface ozone over the continents of up to 2 ppbv and of 2-6 ppbv in the tropical upper troposphere. The effects of CO 2 increases on suppression of isoprene emissions and suppression of dry deposition to vegetation are small compared with the effects of vegetation cover change. Accounting for present-day climate in addition to present-day vegetation cover and atmospheric CO 2 concentrations leads to increases in surface ozone concentrations of up to 5 ppbv over the entire northern hemisphere (NH) and of up to 8 ppbv in the NH free troposphere, compared with a midnineteenth century control simulation. Ozone changes are dominated by the following: (1) the role of isoprene as an ozone sink in the low NO x midnineteenth century atmosphere and (2) the redistribution of NO x to remote regions and the free troposphere via PAN (peroxyacetyl nitrate) formed from isoprene oxidation. We estimate a tropospheric ozone radiative forcing of 0.264 W m -2 and a sensitivity in ozone radiative forcing to midnineteenth century to present-day vegetation cover change of -0.012 W m -2 . |
| first_indexed | 2025-11-14T10:31:33Z |
| format | Journal Article |
| id | curtin-20.500.11937-66935 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:31:33Z |
| publishDate | 2017 |
| publisher | Wiley-Blackwell Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-669352024-06-06T01:39:45Z Sensitivity of midnineteenth century tropospheric ozone to atmospheric chemistry-vegetation interactions Hollaway, M. Arnold, S. Collins, Bill Folberth, G. Rap, A. We use an Earth System model (HadGEM2-ES) to investigate the sensitivity of midnineteenth century tropospheric ozone to vegetation distribution and atmospheric chemistry-vegetation interaction processes. We conduct model experiments to isolate the response of midnineteenth century tropospheric ozone to vegetation cover changes between the 1860s and present day and to CO 2 -induced changes in isoprene emissions and dry deposition over the same period. Changes in vegetation distribution and CO 2 suppression of isoprene emissions between midnineteenth century and present day lead to decreases in global isoprene emissions of 19% and 21%, respectively. This results in increases in surface ozone over the continents of up to 2 ppbv and of 2-6 ppbv in the tropical upper troposphere. The effects of CO 2 increases on suppression of isoprene emissions and suppression of dry deposition to vegetation are small compared with the effects of vegetation cover change. Accounting for present-day climate in addition to present-day vegetation cover and atmospheric CO 2 concentrations leads to increases in surface ozone concentrations of up to 5 ppbv over the entire northern hemisphere (NH) and of up to 8 ppbv in the NH free troposphere, compared with a midnineteenth century control simulation. Ozone changes are dominated by the following: (1) the role of isoprene as an ozone sink in the low NO x midnineteenth century atmosphere and (2) the redistribution of NO x to remote regions and the free troposphere via PAN (peroxyacetyl nitrate) formed from isoprene oxidation. We estimate a tropospheric ozone radiative forcing of 0.264 W m -2 and a sensitivity in ozone radiative forcing to midnineteenth century to present-day vegetation cover change of -0.012 W m -2 . 2017 Journal Article http://hdl.handle.net/20.500.11937/66935 10.1002/2016JD025462 http://creativecommons.org/licenses/by/4.0/ Wiley-Blackwell Publishing fulltext |
| spellingShingle | Hollaway, M. Arnold, S. Collins, Bill Folberth, G. Rap, A. Sensitivity of midnineteenth century tropospheric ozone to atmospheric chemistry-vegetation interactions |
| title | Sensitivity of midnineteenth century tropospheric ozone to atmospheric chemistry-vegetation interactions |
| title_full | Sensitivity of midnineteenth century tropospheric ozone to atmospheric chemistry-vegetation interactions |
| title_fullStr | Sensitivity of midnineteenth century tropospheric ozone to atmospheric chemistry-vegetation interactions |
| title_full_unstemmed | Sensitivity of midnineteenth century tropospheric ozone to atmospheric chemistry-vegetation interactions |
| title_short | Sensitivity of midnineteenth century tropospheric ozone to atmospheric chemistry-vegetation interactions |
| title_sort | sensitivity of midnineteenth century tropospheric ozone to atmospheric chemistry-vegetation interactions |
| url | http://hdl.handle.net/20.500.11937/66935 |